Items were stolen from a shed next to a closed car wash on Bridge Street just before 1.30am on Monday, 20 June.
Now officers investigating the incident want to trace the whereabouts of a grey SAAB, which was captured on CCTV at the time of the offence.
Police also want to know who was driving it at the time of the burglary.
Anyone with information can contact Northamptonshire police on 101 or Crimestoppers, anonymously, on 0800 555 111.